ENT Ear 064b5578 Cailaginous pa of external auditory canal is A Medial 1/3 B Lateral 1/3 C Medial 2/3 D Lateral 2/3 High-Yield Explanation Lateral 1/3rd of the external auditory canal is cailaginous and medial 2/3rd is bony.Ref: Hazarika; 3rd ed; Pg 9